Is there a pin-compatible replacement for MUR1100ERLG?

Currently, no pin-compatible (axial package) replacement with identical or better key parameters has been verified. Any substitute will likely require careful review of its datasheet for package dimensions and electrical characteristics.

What risks should I check before replacing MUR1100ERLG?

Key risks are: 1) Package mismatch, requiring PCB changes. 2) Voltage rating, ensure it has sufficient margin for your design. 3) Recovery time (trr), ensure it's fast enough for your switching frequency.

MUR1100ERLG Alternatives, Datasheet & Cross Reference | onsemi

Q: What is the best alternative to MUR1100ERLG?

Functionally, parts like onsemi's MUR8100EG offer similar electricals but require a board redesign due to the larger TO-220 package. A true alternative depends on your application's space and mounting constraints.

The onsemi MUR1100ERLG is a 1000V, 1A ultrafast rectifier in a compact axial package, ideal for high-frequency power applications. Finding a direct drop-in replacement is challenging due to its specific performance and form factor.

AI replacement insight

Package riskhigh

Axial vs. TO-220/TO-247 requires full redesign.

Electrical riskmedium

Substitutes may have different recovery times or lack voltage margin.

Sourcing risklow

Target part is currently active.

Can it be replaced directly?

No direct pin-compatible replacement has been identified. Alternatives like MUR8100EG are functionally similar but require significant board redesign due to different power packages.

Best replacement path

Search for rectifiers with Vr >= 1100V, Io >= 1A, trr <= 75ns in an axial (DO-204AL/DO-41) package.

Main risk

The primary risk is package incompatibility, requiring a new PCB layout and potentially different thermal management.

Recommended alternatives

A functional alternative with matched speed and higher current, but in a non-compatible TO-220 package.

View details

Alternative comparison matrix

Feature / factor	MUR1100ERLG	MUR8100EG	RHRG75120	Compatibility / risk
Package	Axial, DO-204AL	TO-220-2	TO-247-2	TO-220-2 / TO-247-2 — Requires board and thermal redesign.; RHRG75120: Requires complete board and thermal redesign.
Voltage	1000V	1000V	1200V	1000V / 1200V — Matched, but no safety margin per engineering rules.; RHRG75120: Higher voltage rating provides more margin.
Current	1A	8A	75A	8A / 75A — Higher current capability.; RHRG75120: Significantly higher current capability.
Speed	75ns	75ns	< 85ns	75ns / < 85ns — Recovery time matches target.; RHRG75120: Slightly slower but comparable recovery time.
Lifecycle	Active	-	Last Time Buy	Last Time Buy — Not recommended for new designs.

Application & sourcing insights

Questions & answers